Preprints
https://doi.org/10.5194/wes-2023-135
https://doi.org/10.5194/wes-2023-135
16 Oct 2023
 | 16 Oct 2023
Status: a revised version of this preprint is currently under review for the journal WES.

Dynamic performance of a passively self-adjusting floating wind farm layout to increase the annual energy production

Mohammad Youssef Mahfouz, Ericka Lozon, Matthew Hall, and Po Wen Cheng

Abstract. One of the main differences between floating offshore wind turbines (FOWTs) and fixed-bottom turbines is the angular and translational motions of FOWTs. When it comes to planning a floating wind farm (FWF), the translational motions introduce an additional layer of complexity to the FWF layout. The ability of a FOWT to relocate its position represents an opportunity to mitigate wake losses within an FWF. By passively relocating downwind turbines out of the wake generated by upwind turbines, we can reduce wake-induced energy losses and enhance overall energy production. The translational movements of FOWTs are governed by the mooring system attached to it. The way a FOWT relocates its position changes if the design of the mooring system attached to it changes. Additionally, the translational motion of a FOWT attached to a given mooring system is different for different wind directions. Hence, we can tailor a mooring system design for a FOWT to passively control its motions according to the wind direction. In this work, we present a new self-adjusting FWF layout design, and assess its performance using both static and dynamic methods. The results show that relocating the FOWTs in an FWF can increase the energy production by 3 % using a steady-state wake model and 1.4 % using a dynamic wake model at a wind speed of 10 m/s. Moreover, we compare the fatigue and ultimate loads of the mooring systems of the self-adjusting FWF layout design to the mooring systems in a current state-of-the-art FWF baseline design. The comparison shows that with smaller mooring system diameters, the self-adjusting FWF design has similar fatigue damage compared to the baseline design with bigger mooring system diameters. Finally, the ultimate loads on the mooring systems of the self-adjusting FWF design are lower than those on the mooring systems of the baseline design. 

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Mohammad Youssef Mahfouz, Ericka Lozon, Matthew Hall, and Po Wen Cheng

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2023-135', Anonymous Referee #1, 13 Nov 2023
    • AC1: 'Reply on RC1', Mohammad Mahfouz, 06 Dec 2023
  • RC2: 'Comment on wes-2023-135', Anonymous Referee #2, 30 Nov 2023
    • AC2: 'Reply on RC2', Mohammad Mahfouz, 06 Dec 2023
  • AC3: 'Comment on wes-2023-135', Mohammad Mahfouz, 29 Feb 2024
Mohammad Youssef Mahfouz, Ericka Lozon, Matthew Hall, and Po Wen Cheng

Video supplement

A passively self-adjusting floating wind farm layout design Mohammad Youssef Mahfouz http://doi.org/10.5446/63167

Mohammad Youssef Mahfouz, Ericka Lozon, Matthew Hall, and Po Wen Cheng

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Short summary
As climate change increasingly impacts our daily lives, there is a pressing need for transition towards cleaner energy. With all the growth in floating offshore wind and the planned FWFs in the next few years, we urgently need new techniques and methodologies to accommodate the differences between fixed bottom and FWFs. This paper presents a novel methodology to decrease aerodynamic losses inside a FWF by passively relocating the downwind floating wind turbines out of the wakes.
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